AWWA RSP64399

A key component for developing a pipeline assessment program using Geographic InformationSystem (GIS) tools is the use of accurate and complete data. However, for a variety of reasons,these data may be missing or incomplete. Having a large percentage of missing data cansignificantly hamper (or pose a significant challenge to) the condition assessment process.Among all pipeline characteristics included in a pipeline GIS database (geodatabase), age,diameter, and material are the most important. This paper discusses the approach andassumptions used to account for these missing data for a large metropolitan water distributionsystem in order to conduct a pipeline condition assessment, predict trends, estimate economiclives, develop a reinvestment budget and prioritize pipeline replacement or rehabilitation projects.A primary component of pipeline condition assessments is the evaluation of historical main breakrecords. These records are often maintained separately from the GIS pipeline data and correlationof the break data to pipeline data presents another challenge. Spatially locating main break repairsto a pipeline inventory has limitations due to possible errors in the main break repair address orother unforeseen circumstances. This paper also presents GIS techniques and quality controlchecks that were used to develop a database of high confidence main breaks and provide anaccurate characterization of the condition of the existing system. Includes table, figures.

Product Details

Edition:

Vol. - No.

Published:

03/01/2007

Number of Pages:

7

File Size:

1 file , 420 KB